I was diagnosed with an underactive thyroid last October and started on 50mg Levothyroxine. In October T4 was 10 and TSS was 13.5. Was back in January for follow up blood tests and this time they checked for Antibodies. T4 was up to 16 and TSH had reduced to 4.4 and Antibodies were 388. Now at the time I did not know what the antibodies meant but afterwards googled it and saw about Hashimotos. I was feeling better for a few months and then went seemed to go backwards a bit so went back to my doctor in May to ask if I could get my thyroid checked again. I asked if the antibodies meant that I had Hashimotos and was told not necessarily! Results in May were T4 was 13 and TSH was 1.17 but I was also had a vitamin D deficiency. Due to get another blood test next week but not checking the thyroid as the doctor says it is now ok. Sorry I don't have any lab ranges to add to the above results. Periods have not been very regular which was one of the original reasons for getting my thyroid checked along with always being extremely tired but when I started taking levothyroxine they started again and then have stopped after a couple of months which was another reason why I wanted my thyroid checked again in May. I'm 44 so could be early menopause but I'm not convinced as they started again for a while when I started taking the levothyroxine. Any advise before I go back to the doctor?